Exhaust manifold for internalcombustion engines



Jan. 26, 1954 J. P. MARX EXHAUST MANIFOLD FOR INTERNAL-COMBUSTION ENGINES Filed May 20, 1955 INVENTOR JOSEPH F. M X

Patented Jan. 26, 1954 UNITED STATES g-TEINT OF EICEJ EXHAUST MANIFOLD FOR INTERNAL- COMIBUSTION ENGINES The invention relates to'improvements in exhaust manifolds for internal combustion engines and is more particularly concerned. with the novel construction and assembly of a two-section manifold.

The standard one-piece exhaust manifold on an internal combustion engine is, in most instances, provided with a heat riser to the carburetor. The provision for two exhausts, which is highly advantageous for several well-known reasons, is now conventional in most V-8internal combustion engines; however, there is at present a trend to remove the original one-pieceexhaust manifold on 6-cylinder engines and to substitute in its place a pair'of exhaust'manifolds, each accommodating three cylinders and each having its own exhaust pipe, muffler and tail pipe. When two known types of manifolds replace the original one-piece manifold, there is no means available to conduct heat to the carburetor. This and other disadvantages and shortcomings of the present practices are all overcome by the present construction and it is, therefore, an object of the invention to provide novelmeans to accomplish the desired results.

Another object of the invention is to provide a novel exhaust manifold structure which contemplates the use of a portion of the-original onepiece manifold and to thereby keep the cost of the conversion to aminimum.

Another object is to provide atwo-piece exhaust manifold assembly fora. 6-cylinder internal combustion engine, which includes a heat riser for the carburetor.-

Another object is'to provide a novel two-piece exhaust manifold which is "very efficient in use, easy and inexpensive to install, and very practical.

With the foregoing and other objects in view which will appear as the description proceeds, the invention consists ofcertain novel features of construction, arrangement and combination of parts hereinafter fully described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims; it being understood that various changes in the? form, proportion, size and minor. dtails'of' the structure may be made without departing-from the spirit, or sacrificing any of "the advantages of the invention.

For the purpose of facilitating an understanding of my invention, Ihave illustrated in the accompanying drawings a, preferred embodiment thereof, from an inspection of which when considered in connection with the following description, m invention, its mode;ofl:construction-, assembly and operation and: many of itsadvantages, should be readily understoodand appreciated.

Referring to the drawings'in which thesame characters of reference are employed-toindicate corresponding or similar. parts throughout the several figures of the drawings:

Fig. 1 is a side elevationalnview: of-aninternal combustion engine, showing the noveltwo-piece exhaust manifold installedthereom.

Fig. 2' is an enlarged detailwsectional viewof one of the manifolds, taken-substantially along line 2 2 of Fig; 1.

Fi 3 is asectional detail view taken online 3-3of Fig. 2.

Referring particularly: to*Fig.- v l of the-accompanying drawings; l2 schematically illustrates-a o-cylinder internal combustion engine, having the usual fan and'generatorrbelt I3 at the front end thereof and provided with the usual intake manifold M, which is connected in the usual manner to a carburetor l5. The-engine I2 is provided with two exhaust manifolds lw and I1, each of which is in' communication; through. exhaust ports IS, with three of the cylinders of theengine. The exhaustmanifold-ll may be of any conventional construction? and-,1 as; shown, it is substantially Y'-shaped* and is provided with mounting flanges I 9*toreceivebolts'2l for securing it in place on the engine-block; The base portion of the exhaust manifold 11 hasan external flange 22 withwhich is --matched a; similar flange 23 on an exhaust=pipez2t Bolts; 25'pass through aligned openings in the flanges 22 and 23 for securing the exhaust pipe '24-'to-the exhaust manifold H.

The exhaust manifoldil6 embodies-the features of the present invention; It'may constitute a part of the manifold with which the engine was originally equipped. Such a manifold is provided with a heat riser, shown 8.626. This heat riser includes a surface uponwhich is .secured, as by bolts 21, the base'end of the'carb u'retor l5. It also includes the-usual fluttervalve; (not shown) which is carried'om a shaft extending tothe outside of the manifold'and carries on its end a weighted arm 28! In the embodiment illustrated, the manifold I6 terminates in an open. end 29. This results-'from-cutting off of therear portion of-the orig-inalmanifoldr Itis, therefore, necessary to'seal said open end" and there is, accordingly; provided a plate 3| formed from relativelythick 'steel sheet stocka As illustrated in Fig. 3, the plate 3| has end flanges 32 which overlie and snugly embrace opposed outside surfaces of the manifold [6.

The plate 3| is apertured centrally, as at 33, to receive therethrough the stem 34 of an eyebolt 35. The eye 36 of said eye-bolt is so positioned within the exhaust manifold l6 as to align with a tapped opening 31 provided in one of the walls of said manifold. A fixture stud 38 is threaded into the tapped opening 31 and passes freely through the eye 36 with its free inner end preferably in firm abutment with the inside face of the opposite wall of said manifold.

It should be quite evident that the fixture stud 38 constitutes a mounting for the eye-bolt 35 and that when a nut 39 is screwed upon the projecting externally threaded end of the eye-bolt stem 34, the plate 3| is drawn tightly against the open end 29 of the manifold Hi to seal the same. The manifold 16 is, of course, also connected with an exhaust pipe 4|, as by means of bolts 42, which pass through matching flanges 43 on the respective parts.

The instant structure is such that it is a relatively simple and inexpensive procedure to install dual exhausts in a 6-cylinder internal combustion engine without the creation of the usual back pressures accompanying such installations when made in accordance with prior practices and, further, that the efficiency of the engine is in no way impaired because the necessary heat riser to the carburetor is retained. All that is necessary in order to convert the present one exhaust manifold system to the instant two-exhaust manifold system is to remove the rear portion of the exhaust manifold with which the engine is equipped, mount the eye-bolt and plate assembly to close the cut end of the portion of the exhaust manifold retained, and to then install a separate Y-shaped manifold to accommodate the exhaust from the cylinders not accommodated by the retained portion of the original manifold.

It is believed that my invention, its mode of construction and assembly, and many of its advantages should be readily understood from the foregoing without further description, and it should also be manifest that while a preferred embodiment of the invention has been shown and described for illustrative purposes, the structural details are nevertheless capable of wide variation within the purview of my invention, as defined in the appended claims.

What I claim and desire to secure by Letters Patent of the United States is:

1. An exhaust manifold assembly for an internal combustion engine comprising, in combination, an exhaust manifold section mounted on the engine open at one end, a plate fitted over said open end, means to secure said plate in place tightly, and a second manifold section mounted on said engine.

2. An exhaust manifold comprising, in combination, a substantially tubular member having ports adapted to register with the exhaust ports of an internal combustion engine and an exhaust outlet, a heat riser integral with said member, said member having an open end, and a cover secured tightly over said open end.

3. An exhaust manifold comprising, in combination, a substantially tubular member having ports adapted to register with the exhaust ports of an internal combustion engine and an exhaust outlet, a heat riser integral with said member, said member having an open end, a

4 cover for said open end, and an eye-bolt and nut securing said cover in place.

4. An exhaust manifold comprising, in combination, a substantially tubular member having ports adapted to register with the exhaust ports of an internal combustion engine and an exhaust outlet, a heat riser integral with said member, said member having an open end, a cover secured tightly over said open end, and flanges on said cover.

5. An exhaust manifold having a heat riser and an open end; a plate overlying and closing said open end, a fixed stud in said manifold, an eye-bolt on said stud, said plate having an aperture through which the eye-bolt extends, and means engaging said eyebolt to draw the plate tightly over said open end to seal the same.

6. In an internal combustion engine having a plurality of exhaust ports on one side of the cylinder block and a fuel carburetor, an exhaust manifold section communicating with some of said exhaust ports, an exhaust manifold section communicating with other of said exhaust ports, a heat riser on one of said sections upon which the carburetor is mounted, said one section hav ing an open end, and a plate closing said open end.

'7. In an internal combustion engine having a plurality of exhaust ports on one side of the cylinder block and a fuel carburetor, an exhaust manifold section communicating with some of said exhaust ports, an exhaust manifold section communicating with other of said exhaust ports and a heat riser on one of said sections upon which the carburetor is mounted.

8. In an internal combustion engine having a plurality of exhaust ports on one side of the cylinder block and a fuel carburetor, an exhaust manifold section communicating with some of said exhaust ports, an exhaust manifold section communicating with other of said exhaust ports, a heat riser on one of said sections upon which the carburetor is mounted, said one section having an open end, a plate closing said end, and flanges on at least two edges of said plate to embrace the manifold section on which it is mounted.

9. In an internal combustion engine having a plurality of exhaust ports on one side of the cylinder block and a fuel carburetor, an exhaust manifold section communicating with some of said exhaust ports, an exhaust manifold section communicating with other of said exhaust ports, a heat riser on one of said sections upon which the carburetor is mounted, said one section having an open end, a plate closing said end, and a bolt and nut securing said plate in place.

10. In an internal combustion engine having a plurality of exhaust ports on one side of the cylinder block and a fuel carburetor, an exhaust manifold section communicating with some of said exhaust ports, an exhaust manifold section communicating with other of said exhaust ports, a heat riser on one of said sections upon which the carburetor is mounted, said one section having an open end, a plate closing said end, a bolt mounted in said one manifold section and extending through an opening in the closure plate, and nut threaded on the protruding end of said bolt to secure the plate in place tightly.

JOSEPH P. MARX.

No references cited. 

